BASH19LT1G Equivalent & Substitute Parts

Part Overview

The BASH19LT1G is a general-purpose rectifier diode manufactured by onsemi, rated for 120 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-23-3 package. This diode is classified as a small signal device with standard switching speed characteristics and is actively produced. Substitute parts are identified based on matching electrical performance within specified operating parameters and identical mechanical packaging requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	120	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.25 @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 @ 100 V	nA
Capacitance @ Vr, F	5 @ 0V, 1MHz	pF
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-55 to 175	°C
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the BASH19LT1G is determined by the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed the application requirement
Current - Average Rectified (Io) must equal or exceed the application requirement
Forward voltage (Vf) characteristics must be compatible with circuit design
Reverse recovery time (trr) must support the switching frequency requirements
Reverse leakage current must remain within acceptable limits

Mechanical Compatibility Criteria:

Package type must be SOT-23-3 (TO-236-3, SC-59)
Mounting type must be Surface Mount
Moisture Sensitivity Level (MSL) must be acceptable for assembly processes

Compliance Criteria:

RoHS3 compliance status
Product status must be Active

The BAS19-E3-08 qualifies as a substitute based on matching electrical performance within the specified parameter ranges and identical mechanical packaging, with the exception of maximum reverse voltage rating.

Parameter Comparison

Parameter	BASH19LT1G (onsemi)	BAS19-E3-08 (Vishay)	Match Status
Voltage - DC Reverse (Vr) (Max)	120 V	100 V	Partial
Current - Average Rectified (Io)	200 mA	200 mA	Full
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	1.25 V @ 200 mA	Full
Reverse Recovery Time (trr)	50 ns	50 ns	Full
Current - Reverse Leakage @ Vr	100 nA @ 100 V	100 nA @ 100 V	Full
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	Full
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	Full
Operating Temperature - Junction	-55°C to 175°C	-55°C to 150°C	Partial
Mounting Type	Surface Mount	Surface Mount	Full
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Full
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Full

Engineering Selection Recommendations

Primary Part: BASH19LT1G

The BASH19LT1G is the specified component and remains the first choice for new designs. It is actively produced by onsemi, RoHS3 compliant, and rated for 120 V reverse voltage with unlimited moisture sensitivity rating.

Substitute Part: BAS19-E3-08

The BAS19-E3-08 manufactured by Vishay General Semiconductor - Diodes Division is electrically and mechanically compatible with the BASH19LT1G for applications where the reverse voltage requirement does not exceed 100 V. Both devices share identical forward voltage characteristics, reverse recovery time, reverse leakage current, and capacitance specifications. Both are RoHS3 compliant with MSL 1 rating.

Selection Constraints:

The BAS19-E3-08 is suitable only for circuits where the maximum reverse voltage does not exceed 100 V. The maximum junction operating temperature of the BAS19-E3-08 is 150°C, compared to 175°C for the BASH19LT1G. Applications requiring operation above 150°C junction temperature require the BASH19LT1G.

Frequently Asked Questions (FAQ)

Q: Can the BAS19-E3-08 be used as a direct replacement for the BASH19LT1G in all applications?

A: No. The BAS19-E3-08 has a maximum reverse voltage rating of 100 V, compared to 120 V for the BASH19LT1G. Substitution is valid only when the application reverse voltage does not exceed 100 V. Additionally, the maximum junction temperature rating differs: 150°C for the BAS19-E3-08 versus 175°C for the BASH19LT1G.

Q: Are the packages identical between these two diodes?

A: Yes. Both the BASH19LT1G and BAS19-E3-08 use the SOT-23-3 package (also designated TO-236-3 or SC-59). Both are surface mount devices with identical pinout and footprint compatibility.

Q: Do both parts meet RoHS compliance requirements?

A: Yes. Both the BASH19LT1G and BAS19-E3-08 are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, making them suitable for standard PCB assembly processes.

Q: What are the electrical performance differences between these diodes?

A: The forward voltage, reverse recovery time, reverse leakage current, and capacitance are identical between both parts. The primary differences are the maximum reverse voltage rating (120 V versus 100 V) and maximum junction operating temperature (175°C versus 150°C).

Q: How do I determine if the BAS19-E3-08 is suitable for my application?

A: Verify that your circuit's maximum reverse voltage across the diode does not exceed 100 V and that the maximum junction temperature requirement does not exceed 150°C. If both conditions are met, the BAS19-E3-08 is electrically and mechanically compatible.

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